Bolt anchor



au' 7:59.11?. 2a P15723. Y

/W www Dec. 20, 1938. I C MUSHET` 2,140,919

BOLT ANCHOR Filed Feb. 18, 1937 i I l 40 2. -2 20 a E15-f 20 E575. 4/0 Figli. 4g Figli a INVENTOR "I/4,r\\\\\\\\\\\\\ James C. Mms/79% Patented Dec. 20, 1938 UNITED! sTATes BOLTi ANCHOR i James C. Mushetyltoselle Par-k, N. JL, assignorf to Star 4Expansion Bolt Company,v NewYork,- N.. Y.,

acorporaton of Illinois Application"FebruaryelSg 1937," SerialvNo.-126,369 i' This invention relatesto boltfanchors; Bolt anchors are used` for anchoring bolts in walls of concrete, brick, stone or'other cement-i-Y tious material not adaptedto directly receive andanchor` threaded elements. When such-v anchors arcto beused a hole must rst be' drilled or bored into thefwall to receive the anchor.`

Thisinvention relates to an anchorpreferably of theftamp in type, comprising an inner' meml `ber and an outer member or sleeve adapted -tof be forced longitudinally on theA inner member" and to be'thereby forced laterally into gripping engagement with the Walll opening. This is usually accomplished by providingr a' conical-orl tal"pe1'ed outer surface'on a portion of the inner or expanding member or element.

The invention has for its salient object to provide a boltanchor element soconstructedtand" arranged that the element can beused'to bore 20l or drill the'hole in whichtheA anchor is to be'used" and can' thereafter be lused'as'the inner or ex: panding element of the anchor.` Anotlier'object of the invention lis to provide an anchor element anda tool forilsetherewith,

l5-Uso relatively constructed andarranged that'the tool and anchor can be connectedA together and used to herel ar hole in whichV the anchor is 'to be used.

Another object of the inventionis Ato provide Swan anchor element'and theftool foruse'therewith, soy constructed andarranged that'th'e tool and element can be used in conjunction withA each other toI bore the hole and thereafter 'the' tool can be used toitamptheouter element'of- 35fthe anchor, thus setting the anchor in the'hole.

Another object of the invention is to providea tool of the character' described havingn means: thereon for gauging the depth of .the hole bored by the use of the toolfand anchorxelement;

Further objects of the invention will appear from the following specification taken.in.con nection .with the drawing ,which .forms a-part :of thisapplication, and inwhch Y Fig; 1 is a longitudinal sectional zelevatio-nrof-z an inner anchor element constructed in accordi-` ance'ffwith the invention;

Fig: 2 4is an elevationallview partlyini sections offa tool constructedforluse With thefanchor ele-rv` 50 .i ment shown iniFig.. 1; I

Fig. 3 is-'za longitudinal sectionalelevation'oi an outer anchor element adapted A for use-,witl'rz, the inner element shown in Fig. 1;

Fig.:` 4; vfis a View Asimilar to Fig; `3 -fb'utrshowing 55f a shorter outerlanchor element;4 Y

showing 'the inner =anclror1elment fandtoolcone f nected together and disposed in a hole which hasv been bb d-ftlierebyv mls A a-secti`o'nal *elevation showing an ane chor inserted in 1-tlfiefh'olpriorfto the/expansion of the outer sleeve or element to set the anchor;

Fig. v`-is 'aLvieW-fsimilarto Fg. 9 but showing the outer-v' anchor 'element -forced laterally if into' gripping engagement ywith the-wall: opening;y

Figrll isaeview simi-lan'toFig. 9 but showing l a shorter-fouteranchorelement` or=sleeveand a. collar mounted-fon the outersurface of thefinner element-r and' Vengagingtheouter end or" 1thesleeve:

Fig; 122 is iaivviewisimil'anto li'g,` 11 but= showing the collari forced inwardly on the inner element, thereby forcingithe sleeverlaterallylinto gripping engagement with the wall opening;v

Fig;` 13 'is avieWsimilarrtoligs 9 and'll'flout showingthe outer anchor element or sleeve cone structed: .inithe manner shown' in Figs.`` Gland 7;'

Fig; 14 .fis-,a View similar tdFig, 13 but showing theyV outeri` element lexpandedior 1 forced laterally into; gripping engagement -Withfthe Wall'opening;

Fig, 15`1is1a-vieWf1 similar, tofFig. 2'fbut showing a modified iformiofs` toolf; and I Figi'. 16 is a sectionalfelvation of a modified form l,of I anchor embodying Vthe A* invention'.

Th'eainventi'ombriefly describedconsis'ts of any innerfanchor :element havinga longitudinal bore therethrough '..andhaving .rthe inner end portion thereof taperedvor fiaredroutwardly,` orhavi-ng an abutment formed thereon, thefinneren'd'of the elementy having.; a cutting edge formed thereon. Thefoute'r endf of "the bore fis-threaded and Sa tool is provided for use withi the anchor= having a recess 'to'lreceive ai portion of the outer surface o-ff'th'eS-zan'chorc element` and lhavinga threaded pinror studth'erein adaptedto receive 'theftl'ireade ed portionfofiithe bore of the' anchorelement.- Whenthe to'ol and anchor element `areassembledftther; anchor element will -form fa drill` and can be used to bore a hole in the wall of concrete, brick;:.stone or other' material, to receivethe anchor;V

After-the holefhas beenbored the tooland an: chor elementfaref separated and an? outerfexpansible sleeve placed ontl then inner fi anchor vele-` ment and the anchor is inserted on the hole. The tool can then be used to engage the outer end of the expansible sleeve and force this sleeve longitudinally on the inner element and laterally into gripping engagement with the wall opening.

If the wall opening has a depth substantially equal to the length of the anchor, a short outer sleeve can be assembled on the inner anchor element and a collar can be placed around the outer end of this element. Thereafter the collar can be driven inwardly by blows of a hammer, thus expanding the sleeve.

Furthermore, if desired, the outer element can be formed with a split inner end which upon engagement with the tapered outer surface of the inner element will expand laterally as the sleeve is forced inwardly on the inner anchor element.

Further details of the invention willappear from the following description.

In the embodiment of the invention shown in the drawing, the inner anchor element comprises a hollow body portion 20, preferably cylindrical on its outer surface, and an inner flared or tapered portion 2 I. The inner end of the anchor is preferably cylindrical, as shown at 22, on its outer surface and is tapered, as shown at 23, on its inner surface, forming a V-shaped cutting edge on the inner end of the anchor element. The outer end of the bore is threaded, as shown at 24.

The anchor element above described is preferably formed of hard metal, such as hardened steel, in order to serve as a cutting member or drill.

One form of tool adapted for use with the anchor element in Fig. 1 is illustrated in Fig. 2 and comprises a holder or rod 25 having a recess 26 at one end thereof. A threaded stud or pin 21 is mounted in the end of the rod or holder and extends centrally into the recess 26. The tool shown in Fig. 15 is similar to that shown in Fig. 2, but in the former the central stud 28 is split to provide resilient prongs or tines 29 adapted to enter the threaded bore 24 of the inner anchor element.

The recess 25 is so dimensioned as to receive the cylindrical portion of the body 2U of the anchor element and this element is threaded on the pin 21, as shown in Fig. 8. The recess 26is of such a depth as to receive the full length of the cylindrical outer portion of the anchor element and when these parts are assembled the tapered outer surface 2| is disposed outside of the recess and beyond the end of the holder. When the parts are so assembled the combination tool and anchor can be used as a drill to bore a hole in the wall in the mannerY shown in Fig. 8 and in order to gauge the depth of the hole the tool has formed thereon at spaced intervals circumferential grooves 30.

The groove nearest the inner end of the tool indicates the depth to drill the hole for the anchor to be set flush in the hole. By means of the depth gauge the holes can be all drilled to the desired depth and anchors of a group can all be drilled to the same depth to accommodate bolts of the same length. The markings can be spaced to accord with variations in length of standard commercial bolts as, for instance, onehalf inch.

When the hole has been bored to the desired depth the tool and anchor element are removed from the hole and the anchor elementr is rotated in the proper direction to separate the threaded bore from the pin or stud 21. Thereupon, the

outer anchor element is assembled on the inner element in the manner shown in Fig. 9. The outer element consists of a sleeve 35 having a cylindrical bore 36 adapted to t over the cylindrical outer portion of the inner element and having a tapered inner end 31 adapted to surround and iit the tapered inner portion 2| of the inner element. After the anchor has been inserted in the hole in the manner shown in Fig, 9, the tool is again used and in this instance the inner end 38 of the tool engages the outer end 38 of the sleeve 35 which is preferably formed of soft or ductile metal and as the outer end of the tool is tapped with a hammer the sleeve will be forced longitudinally on the inner anchor element and because of the engagement of the inner end of the sleeve with the tapered outer surface Vof the inner anchor element the metal of the sleeve will be forced laterally into firm gripping engagement with the wall opening and the anchor will be set.

If the hole in the wall is bored only to a depth corresponding substantially to the length of the anchor, a relatively short sleeve 40, such as is shown in Fig. 4, can be used. This sleeve is assembled on the inner anchor element and thereafter a collarrrll is placed on the outer end of the inner element in engagement with the outer end of the sleeve. The outer end of the collar is then tapped with a hammer which will force the collar inwardly on the inner anchor element and will force the sleeve laterally into gripping engagement with the wall opening.

If desired, a sleeve such as that shown in Figs. 6 and 7 may be used in conjunction with the inner Vanchor element. This sleeve 42 has its inner tapered portion 43 split, as shown at 44, the sleeve in this instance being formed of relatively hard metal. When the sleeve and inner element are assembled as shown in Fig. 13 and inserted in the wall opening, the outer end of the sleeve can be engaged by a hammer and can thus be forced inwardly to the position shown in Fig. 14, in which it will be seen that the inner end of the sleeve has been expanded into gripping engagement with the wall opening.

If desired, the inner anchor element may be formed as shown in Fig. 16, with an annular abutment 45 on its outer surface. 'Ihe sleeve 46 abuts against the abutment 45.

lAlthough certain specific embodiments of the invention have been particularly shown and described, it will be understood that the invention is capable of modification and that 'changes in the construction andV in the arrangement of the various cooperating parts may be made without departing from the spirit or scope of the invention, as expressed in the following claims.

What I claim is:

1. In combination, a combination anchor element and hollow drill having a threaded bore and an outwardly flared end portion provided with a cutting edge and a tool having a. recess to receive the outer portion of the anchor element and a threaded stud therein to engage the threaded bore.

2. In combination, a hollow drill having a threaded bore, a cylindrical body portion and an outwardly flared end portion provided with a cutting edge and a tool having a cylindrical recess to receive the cylindrical portion of the drill and a threaded stud therein to engage the threaded bore.

3. In combination, a hollow drill having a threaded bore, a smooth outer portion and an outwardly flared end portion provided with a cutting edge and a tool having a centrally disposed threaded portion engageable with the threaded bore of the anchor element and a recess with a smooth inner surface to receive the smooth outer portion of the drill.

4. In combination, a combination anchor element and hollow drill having a threaded bore, a cylindrical body portion and an outwardly flared end portion provided with a cutting edge and a tool having a cylindrical recess to receive the cylindrical portion of the anchor element and `a centrally disposed stud therein arranged to enter said threaded bore.

5. A tool for use with an internally threaded boring element, having a recess for receiving a portion of the element and having a centrally disposed stud arranged to enter the threaded portion of the element, said stud having means for engaging the Wall of the bore of said boring element to retain th-e stud therein.

6. A tool for use with a threaded boring element, having a recess for receiving a portion of the element and having a centrally disposed stud, said stud having resilient tines arranged to enter the threaded portion of the element.

7. A tool for use with a threaded boring element, having a recess for receiving a portion of the element and having a centrally disposed stud arranged to enter the threaded portion of the element, said tool having depth gauge markings on the outer surface thereof, including a marking opposite the inner end of the recess to indicate the depth to be drilled to receive an anchor flush with the outer end of the hole.

8. A combination drill handle and tamping tool for use with a combination anchor element and hollow drill having a threaded bore, said anchor element being combined with an outer soft metal sleeve to form an anchor unit, the combination anchor element and drill having an outwardly ared end portion provided with a cutting edge having a diameter as great as the outside diameter of the soft metal sleeve, said combination handle and tamping tool having a recess to receive the outer end of the anchor element and a stud therein to enter the threaded bore, the Wall surrounding the recess being adapted for use with the anchor unit to tamp the outer end of the sleeve.

JAMES C. MUSHET. 

